jquery插件开发样例-jquery插件开发（1）

/*! * jQuery lightweight plugin boilerplate * Original author: @ajpiano * Further changes, comments: @addyosmani * Licensed under the MIT license */// the semi-colon before the function invocation is a safety// net against concatenated scripts and/or other plugins// that are not closed properly.;(function ( $, window, document, undefined ) {    // undefined is used here as the undefined global    // variable in ECMAScript 3 and is mutable (i.e. it can    // be changed by someone else). undefined isn't really    // being passed in so we can ensure that its value is    // truly undefined. In ES5, undefined can no longer be    // modified.    // window and document are passed through as local    // variables rather than as globals, because this (slightly)    // quickens the resolution process and can be more    // efficiently minified (especially when both are    // regularly referenced in your plugin).    // Create the defaults once    var pluginName = 'defaultPluginName',        defaults = {            propertyName: "value"        };    // The actual plugin constructor    function Plugin( element, options ) {        this.element = element;        // jQuery has an extend method that merges the        // contents of two or more objects, storing the        // result in the first object. The first object        // is generally empty because we don't want to alter        // the default options for future instances of the plugin        this.options = $.extend( {}, defaults, options) ;        this._defaults = defaults;        this._name = pluginName;        this.init();    }    Plugin.prototype.init = function () {        // Place initialization logic here        // You already have access to the DOM element and        // the options via the instance, e.g. this.element        // and this.options    };    // A really lightweight plugin wrapper around the constructor,    // preventing against multiple instantiations    $.fn[pluginName] = function ( options ) {        return this.each(function () {            if (!$.data(this, 'plugin_' + pluginName)) {                $.data(this, 'plugin_' + pluginName,                new Plugin( this, options ));            }        });    }})( jQuery, window, document );